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-rw-r--r--third_party/aom/av1/common/scale.c164
1 files changed, 164 insertions, 0 deletions
diff --git a/third_party/aom/av1/common/scale.c b/third_party/aom/av1/common/scale.c
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+++ b/third_party/aom/av1/common/scale.c
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+/*
+ * Copyright (c) 2016, Alliance for Open Media. All rights reserved
+ *
+ * This source code is subject to the terms of the BSD 2 Clause License and
+ * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
+ * was not distributed with this source code in the LICENSE file, you can
+ * obtain it at www.aomedia.org/license/software. If the Alliance for Open
+ * Media Patent License 1.0 was not distributed with this source code in the
+ * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
+ */
+
+#include "./aom_dsp_rtcd.h"
+#include "av1/common/filter.h"
+#include "av1/common/scale.h"
+#include "aom_dsp/aom_filter.h"
+
+static INLINE int scaled_x(int val, const struct scale_factors *sf) {
+ return (int)((int64_t)val * sf->x_scale_fp >> REF_SCALE_SHIFT);
+}
+
+static INLINE int scaled_y(int val, const struct scale_factors *sf) {
+ return (int)((int64_t)val * sf->y_scale_fp >> REF_SCALE_SHIFT);
+}
+
+static int unscaled_value(int val, const struct scale_factors *sf) {
+ (void)sf;
+ return val;
+}
+
+static int get_fixed_point_scale_factor(int other_size, int this_size) {
+ // Calculate scaling factor once for each reference frame
+ // and use fixed point scaling factors in decoding and encoding routines.
+ // Hardware implementations can calculate scale factor in device driver
+ // and use multiplication and shifting on hardware instead of division.
+ return (other_size << REF_SCALE_SHIFT) / this_size;
+}
+
+MV32 av1_scale_mv(const MV *mv, int x, int y, const struct scale_factors *sf) {
+ const int x_off_q4 = scaled_x(x << SUBPEL_BITS, sf) & SUBPEL_MASK;
+ const int y_off_q4 = scaled_y(y << SUBPEL_BITS, sf) & SUBPEL_MASK;
+ const MV32 res = { scaled_y(mv->row, sf) + y_off_q4,
+ scaled_x(mv->col, sf) + x_off_q4 };
+ return res;
+}
+
+#if CONFIG_HIGHBITDEPTH
+void av1_setup_scale_factors_for_frame(struct scale_factors *sf, int other_w,
+ int other_h, int this_w, int this_h,
+ int use_highbd) {
+#else
+void av1_setup_scale_factors_for_frame(struct scale_factors *sf, int other_w,
+ int other_h, int this_w, int this_h) {
+#endif
+ if (!valid_ref_frame_size(other_w, other_h, this_w, this_h)) {
+ sf->x_scale_fp = REF_INVALID_SCALE;
+ sf->y_scale_fp = REF_INVALID_SCALE;
+ return;
+ }
+
+ sf->x_scale_fp = get_fixed_point_scale_factor(other_w, this_w);
+ sf->y_scale_fp = get_fixed_point_scale_factor(other_h, this_h);
+ sf->x_step_q4 = scaled_x(16, sf);
+ sf->y_step_q4 = scaled_y(16, sf);
+
+ if (av1_is_scaled(sf)) {
+ sf->scale_value_x = scaled_x;
+ sf->scale_value_y = scaled_y;
+ } else {
+ sf->scale_value_x = unscaled_value;
+ sf->scale_value_y = unscaled_value;
+ }
+
+ // TODO(agrange): Investigate the best choice of functions to use here
+ // for EIGHTTAP_SMOOTH. Since it is not interpolating, need to choose what
+ // to do at full-pel offsets. The current selection, where the filter is
+ // applied in one direction only, and not at all for 0,0, seems to give the
+ // best quality, but it may be worth trying an additional mode that does
+ // do the filtering on full-pel.
+ if (sf->x_step_q4 == 16) {
+ if (sf->y_step_q4 == 16) {
+ // No scaling in either direction.
+ sf->predict[0][0][0] = aom_convolve_copy;
+ sf->predict[0][0][1] = aom_convolve_avg;
+ sf->predict[0][1][0] = aom_convolve8_vert;
+ sf->predict[0][1][1] = aom_convolve8_avg_vert;
+ sf->predict[1][0][0] = aom_convolve8_horiz;
+ sf->predict[1][0][1] = aom_convolve8_avg_horiz;
+ } else {
+ // No scaling in x direction. Must always scale in the y direction.
+ sf->predict[0][0][0] = aom_convolve8_vert;
+ sf->predict[0][0][1] = aom_convolve8_avg_vert;
+ sf->predict[0][1][0] = aom_convolve8_vert;
+ sf->predict[0][1][1] = aom_convolve8_avg_vert;
+ sf->predict[1][0][0] = aom_convolve8;
+ sf->predict[1][0][1] = aom_convolve8_avg;
+ }
+ } else {
+ if (sf->y_step_q4 == 16) {
+ // No scaling in the y direction. Must always scale in the x direction.
+ sf->predict[0][0][0] = aom_convolve8_horiz;
+ sf->predict[0][0][1] = aom_convolve8_avg_horiz;
+ sf->predict[0][1][0] = aom_convolve8;
+ sf->predict[0][1][1] = aom_convolve8_avg;
+ sf->predict[1][0][0] = aom_convolve8_horiz;
+ sf->predict[1][0][1] = aom_convolve8_avg_horiz;
+ } else {
+ // Must always scale in both directions.
+ sf->predict[0][0][0] = aom_convolve8;
+ sf->predict[0][0][1] = aom_convolve8_avg;
+ sf->predict[0][1][0] = aom_convolve8;
+ sf->predict[0][1][1] = aom_convolve8_avg;
+ sf->predict[1][0][0] = aom_convolve8;
+ sf->predict[1][0][1] = aom_convolve8_avg;
+ }
+ }
+ // 2D subpel motion always gets filtered in both directions
+ sf->predict[1][1][0] = aom_convolve8;
+ sf->predict[1][1][1] = aom_convolve8_avg;
+
+#if CONFIG_HIGHBITDEPTH
+ if (use_highbd) {
+ if (sf->x_step_q4 == 16) {
+ if (sf->y_step_q4 == 16) {
+ // No scaling in either direction.
+ sf->highbd_predict[0][0][0] = aom_highbd_convolve_copy;
+ sf->highbd_predict[0][0][1] = aom_highbd_convolve_avg;
+ sf->highbd_predict[0][1][0] = aom_highbd_convolve8_vert;
+ sf->highbd_predict[0][1][1] = aom_highbd_convolve8_avg_vert;
+ sf->highbd_predict[1][0][0] = aom_highbd_convolve8_horiz;
+ sf->highbd_predict[1][0][1] = aom_highbd_convolve8_avg_horiz;
+ } else {
+ // No scaling in x direction. Must always scale in the y direction.
+ sf->highbd_predict[0][0][0] = aom_highbd_convolve8_vert;
+ sf->highbd_predict[0][0][1] = aom_highbd_convolve8_avg_vert;
+ sf->highbd_predict[0][1][0] = aom_highbd_convolve8_vert;
+ sf->highbd_predict[0][1][1] = aom_highbd_convolve8_avg_vert;
+ sf->highbd_predict[1][0][0] = aom_highbd_convolve8;
+ sf->highbd_predict[1][0][1] = aom_highbd_convolve8_avg;
+ }
+ } else {
+ if (sf->y_step_q4 == 16) {
+ // No scaling in the y direction. Must always scale in the x direction.
+ sf->highbd_predict[0][0][0] = aom_highbd_convolve8_horiz;
+ sf->highbd_predict[0][0][1] = aom_highbd_convolve8_avg_horiz;
+ sf->highbd_predict[0][1][0] = aom_highbd_convolve8;
+ sf->highbd_predict[0][1][1] = aom_highbd_convolve8_avg;
+ sf->highbd_predict[1][0][0] = aom_highbd_convolve8_horiz;
+ sf->highbd_predict[1][0][1] = aom_highbd_convolve8_avg_horiz;
+ } else {
+ // Must always scale in both directions.
+ sf->highbd_predict[0][0][0] = aom_highbd_convolve8;
+ sf->highbd_predict[0][0][1] = aom_highbd_convolve8_avg;
+ sf->highbd_predict[0][1][0] = aom_highbd_convolve8;
+ sf->highbd_predict[0][1][1] = aom_highbd_convolve8_avg;
+ sf->highbd_predict[1][0][0] = aom_highbd_convolve8;
+ sf->highbd_predict[1][0][1] = aom_highbd_convolve8_avg;
+ }
+ }
+ // 2D subpel motion always gets filtered in both directions.
+ sf->highbd_predict[1][1][0] = aom_highbd_convolve8;
+ sf->highbd_predict[1][1][1] = aom_highbd_convolve8_avg;
+ }
+#endif // CONFIG_HIGHBITDEPTH
+}
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